Samuel c



(No Model.)

S. 0. HARLAN.

LocK. I No. 404,835. Patented June 11, 1889..

UNITED STATES PATENT OFFICE.

SAMUEL O. HARLAN, OF LAKE CITY, MINNESOTA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 404,835, dated June 11, 1889.

Application filed March 22, 1888.

To to whom it may concern.-

Be it known that I, SAMUEL C. HARLAN, a citizen of the United States, residing at Lake City, in the county of Vabasha and State of Minnesota, have invented a new and useful Combined Door Lock and Latch, of which the following is a specification.

My invention relates to improvements in door-locks.

The objects of my improvements are, first, simplicity, durability, and cheapness of construction; second, to have an adjustable spring, so that its tension can be increased or decreased, as might be desired, and, third, to have a look not easily picked by burglars or others. I attain these objects by the mechanism illustrated in the accompanying drawings, in Which Figure 1 is a View of the inside of my device after the outer or upper plate is removed. Fig. 2 is a view of the under or opposite side of the bolt B. Fig. 3 is a View of the spring D that is placed back of the lower part of the bolt.

Similar letters refer to similar parts throughout the different views.

The lower plate is represented by the letters a a a, with acenter-post p to screw the upper plate onto. It has four otherposts or lugs b, 0, (Z, and e to hold and brace the springs C and D. There is also a lug Zfor the bolt B to rest on and to assist in keeping the bolt B from moving back when the door is locked.

The letter it refers to the key-hole. There is also a hole for the axis of the tumbler A to rest in.

A is the tumbler common to all door-latches. The hole h is for the axle of the door-knob to pass through.

The bolt is represented by B, and is used as a common door-latch and also as a door-lock. The back part is widened out,with open space for the tumbler A to work in. The lug m on its under side or rim is to prevent the bolt B from moving backward when the door is locked. The notches n n in the upper edge of the bolt B are for the lug y of the spring Serial No. 268,169. (No model.)

O to pass in to spring the bolt forward. By this arrangement the tension of the spring 0 can be increased or diminished, as may be spring D is so fastened and placed that the key raises it before it moves the bolt B, as seen in Fig. 1. The main object of this spring D is to make it more difficult for burglars or others to pick the lock, and may be omitted whenever a simpler lock is desired.

The adjustable circular spring 0, which is formed somewhat similar to a capital 0, with a lug y at its extended lower end to pass into one of the notchesn n of the bolt B, is made of spring-steel, and may be either flat or round, and having a hooked turn at the other end to hook over the post or lug b, and is braced by the post or lug c. This spring answers two purposesto throw the bolt B forward and to press against the bolt B whenever the bolt is raised, thus securing a firmer lock or fastening of the door.

Having fully described my invention,what I desire to claim and secure by Letters Patent 1s The combination, in door-locks, of the lower plate or casing a a a, having a center-post p and lugs Z, Z), e, (Z, and e, a bolt B, for a latch and lock, provided with notches n, a lug m, a shoulder f, and two shoulders s s, with a spring C, having lug 3 and a spring D, with its shoulder g, all substantially as set forth.

SAMUEL C. HARLAN.

\Vitnesses:

DAVID FORDING, HEATON W. HARRIS. 

